Subject: Re: [xsl] Creating new, distinct groups of ranges from an aggregation of individual ranges From: "Paul Tyson phtyson@xxxxxxxxxxxxx" <xsllistservice@xxxxxxxxxxxxxxxxxxxxxx> Date: Tue, 18 Nov 2014 14:07:57 0000 
A fascinating problem, for which I've coded various partial solutions in 3 or 4 languages over the years. As you've suggested, a simple workable approach is to make a list of end points, put them in order, and pair them off to form new ranges. (I've never thought of this as a "grouping" problem.) I've also implemented it as a segment tree (see in Wikipedia). This is particularly elegant and can solve problems that are very difficult otherwise (e.g. Is there a configuration where all components are like X?) There are other approaches but typing on phone is tedious so if you are interested let me know. Regards, Paul > On Nov 17, 2014, at 23:07, Michael Friedman sumarimike@xxxxxxxxxxx <xsllistservice@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > Greetings, > > I'm trying to use XSLT 2.0 to create a new set of grouped ranges based on the overlap of an aggregation of a set of noncontiguous individual ranges. Example: > > Given a range of numbers as an individual set: > 1. <range>150202</range> > 2. <range>201225</range> > 3. <range>201204</range> > 4. <range>205234</range> > 5. <range>226234, 250260</range> > > I'm trying to produce a new grouping based on the way the groups overlap: > 150200 (this is where <range> 1 starts and overlaps to 2 & 3) > 201202 (this is where 1 & 2 overlap, and group 1 ends) > 203204 (this is where 2 & 3 overlap and 3 ends) > 205225 (this is where 4 starts and begins to overlap with 5) > 226234 (this is where 4 & 5 overlap and end for the first part of 5) > 250260 (this is where the second range in 5 exists) > > The start and end point of the individual source ranges form the boundaries. > > I expect to end up with a string or variable structure like: > <finalrange> > <range>150200</range> > <range>201202</range> > etc > </finalrange> > or: > <range start="150" end="200"/> > <range start="201" end="202"/> > etc > > Ultimately I have to format some content in XSLFO based on the XML's participation in the "new" given range grouping. If you know aircraft effectivity, this is what I am trying to group. > > I've been using <xsl:sequence> to find all the numbers of a single range, so I can do compares against individual numbers in the entire range, if necessary. But, it seems like it may be easier to just work with the boundaries: the start and end points and see if a value falls within it, somehow, rather than iterating repetitively through enumerations of sequences. > > I've been searching the archives for a while and have found some evocative possibilities from Dimitre Novatchev and Michael Kay, but I can't quite find a way to work with the overlapping. I'm continuing to study their ranging/grouping examples, but help would be appreciated! > > Thanks, > Michael Friedman > XSLList info and archive > EasyUnsubscribe (by email)
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